* Re: + mm-swap-add-cluster-lock-v5.patch added to -mm tree
[not found] <587eaca3.MRSwND8OEi+lF+VH%akpm@linux-foundation.org>
@ 2017-01-18 8:37 ` Michal Hocko
2017-01-18 20:23 ` Andrew Morton
0 siblings, 1 reply; 3+ messages in thread
From: Michal Hocko @ 2017-01-18 8:37 UTC (permalink / raw)
To: akpm
Cc: ying.huang, aarcange, aaron.lu, ak, borntraeger, corbet,
dave.hansen, hannes, hillf.zj, hughd, kirill.shutemov, minchan,
riel, shli, tim.c.chen, vdavydov.dev, mm-commits, linux-mm
On Tue 17-01-17 15:45:39, Andrew Morton wrote:
[...]
> From: "Huang\, Ying" <ying.huang@intel.com>
> Subject: mm-swap-add-cluster-lock-v5
I assume you are going to fold this into the original patch. Do you
think it would make sense to have it in a separate patch along with
the reasoning provided via email?
> Link: http://lkml.kernel.org/r/878tqeuuic.fsf_-_@yhuang-dev.intel.com
> Signed-off-by: "Huang, Ying" <ying.huang@intel.com>
> Cc: Tim Chen <tim.c.chen@linux.intel.com>
> Cc: Aaron Lu <aaron.lu@intel.com>
> Cc: Andi Kleen <ak@linux.intel.com>
> Cc: Andrea Arcangeli <aarcange@redhat.com>
> Cc: Christian Borntraeger <borntraeger@de.ibm.com>
> Cc: Dave Hansen <dave.hansen@intel.com>
> Cc: Hillf Danton <hillf.zj@alibaba-inc.com>
> Cc: Huang Ying <ying.huang@intel.com>
> Cc: Hugh Dickins <hughd@google.com>
> Cc: Johannes Weiner <hannes@cmpxchg.org>
> Cc: Jonathan Corbet <corbet@lwn.net> escreveu:
> Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
> Cc: Michal Hocko <mhocko@kernel.org>
> Cc: Minchan Kim <minchan@kernel.org>
> Cc: Rik van Riel <riel@redhat.com>
> Cc: Shaohua Li <shli@kernel.org>
> Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
> ---
>
> include/linux/swap.h | 19 ++++++++++---------
> mm/swapfile.c | 32 ++++++++++++++++----------------
> 2 files changed, 26 insertions(+), 25 deletions(-)
>
> diff -puN include/linux/swap.h~mm-swap-add-cluster-lock-v5 include/linux/swap.h
> --- a/include/linux/swap.h~mm-swap-add-cluster-lock-v5
> +++ a/include/linux/swap.h
> @@ -176,16 +176,17 @@ enum {
> * protected by swap_info_struct.lock.
> */
> struct swap_cluster_info {
> - unsigned long data;
> + spinlock_t lock; /*
> + * Protect swap_cluster_info fields
> + * and swap_info_struct->swap_map
> + * elements correspond to the swap
> + * cluster
> + */
> + unsigned int data:24;
> + unsigned int flags:8;
> };
> -#define CLUSTER_COUNT_SHIFT 8
> -#define CLUSTER_FLAG_MASK ((1UL << CLUSTER_COUNT_SHIFT) - 1)
> -#define CLUSTER_COUNT_MASK (~CLUSTER_FLAG_MASK)
> -#define CLUSTER_FLAG_FREE 1 /* This cluster is free */
> -#define CLUSTER_FLAG_NEXT_NULL 2 /* This cluster has no next cluster */
> -/* cluster lock, protect cluster_info contents and sis->swap_map */
> -#define CLUSTER_FLAG_LOCK_BIT 2
> -#define CLUSTER_FLAG_LOCK (1 << CLUSTER_FLAG_LOCK_BIT)
> +#define CLUSTER_FLAG_FREE 1 /* This cluster is free */
> +#define CLUSTER_FLAG_NEXT_NULL 2 /* This cluster has no next cluster */
>
> /*
> * We assign a cluster to each CPU, so each CPU can allocate swap entry from
> diff -puN mm/swapfile.c~mm-swap-add-cluster-lock-v5 mm/swapfile.c
> --- a/mm/swapfile.c~mm-swap-add-cluster-lock-v5
> +++ a/mm/swapfile.c
> @@ -200,66 +200,66 @@ static void discard_swap_cluster(struct
> #define LATENCY_LIMIT 256
>
> static inline void cluster_set_flag(struct swap_cluster_info *info,
> - unsigned int flag)
> + unsigned int flag)
> {
> - info->data = (info->data & (CLUSTER_COUNT_MASK | CLUSTER_FLAG_LOCK)) |
> - (flag & ~CLUSTER_FLAG_LOCK);
> + info->flags = flag;
> }
>
> static inline unsigned int cluster_count(struct swap_cluster_info *info)
> {
> - return info->data >> CLUSTER_COUNT_SHIFT;
> + return info->data;
> }
>
> static inline void cluster_set_count(struct swap_cluster_info *info,
> unsigned int c)
> {
> - info->data = (c << CLUSTER_COUNT_SHIFT) | (info->data & CLUSTER_FLAG_MASK);
> + info->data = c;
> }
>
> static inline void cluster_set_count_flag(struct swap_cluster_info *info,
> unsigned int c, unsigned int f)
> {
> - info->data = (info->data & CLUSTER_FLAG_LOCK) |
> - (c << CLUSTER_COUNT_SHIFT) | (f & ~CLUSTER_FLAG_LOCK);
> + info->flags = f;
> + info->data = c;
> }
>
> static inline unsigned int cluster_next(struct swap_cluster_info *info)
> {
> - return cluster_count(info);
> + return info->data;
> }
>
> static inline void cluster_set_next(struct swap_cluster_info *info,
> unsigned int n)
> {
> - cluster_set_count(info, n);
> + info->data = n;
> }
>
> static inline void cluster_set_next_flag(struct swap_cluster_info *info,
> unsigned int n, unsigned int f)
> {
> - cluster_set_count_flag(info, n, f);
> + info->flags = f;
> + info->data = n;
> }
>
> static inline bool cluster_is_free(struct swap_cluster_info *info)
> {
> - return info->data & CLUSTER_FLAG_FREE;
> + return info->flags & CLUSTER_FLAG_FREE;
> }
>
> static inline bool cluster_is_null(struct swap_cluster_info *info)
> {
> - return info->data & CLUSTER_FLAG_NEXT_NULL;
> + return info->flags & CLUSTER_FLAG_NEXT_NULL;
> }
>
> static inline void cluster_set_null(struct swap_cluster_info *info)
> {
> - cluster_set_next_flag(info, 0, CLUSTER_FLAG_NEXT_NULL);
> + info->flags = CLUSTER_FLAG_NEXT_NULL;
> + info->data = 0;
> }
>
> -/* Protect swap_cluster_info fields and si->swap_map */
> static inline void __lock_cluster(struct swap_cluster_info *ci)
> {
> - bit_spin_lock(CLUSTER_FLAG_LOCK_BIT, &ci->data);
> + spin_lock(&ci->lock);
> }
>
> static inline struct swap_cluster_info *lock_cluster(struct swap_info_struct *si,
> @@ -278,7 +278,7 @@ static inline struct swap_cluster_info *
> static inline void unlock_cluster(struct swap_cluster_info *ci)
> {
> if (ci)
> - bit_spin_unlock(CLUSTER_FLAG_LOCK_BIT, &ci->data);
> + spin_unlock(&ci->lock);
> }
>
> static inline struct swap_cluster_info *lock_cluster_or_swap_info(
> _
>
> Patches currently in -mm which might be from ying.huang@intel.com are
>
> mm-swap-fix-kernel-message-in-swap_info_get.patch
> mm-swap-add-cluster-lock.patch
> mm-swap-add-cluster-lock-v5.patch
> mm-swap-split-swap-cache-into-64mb-trunks.patch
> mm-swap-add-cache-for-swap-slots-allocation-fix.patch
> mm-swap-skip-readahead-only-when-swap-slot-cache-is-enabled.patch
--
Michal Hocko
SUSE Labs
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